Question

I am going to use ajax for my web form app without any update panels. so I have noticed that I can use jquery ajax for this purpose.so there is a form with a dropdown box within that are some IDs.
When I select The ID from drop down, I want to show my ajax loader for moments and after that I want to show the result. the result will display in some label controls.
so this is my Default.aspx page :

<div style="text-align: center; width: 500px; margin: 0 auto 0 auto;">
    <asp:DropDownList ID="idDropDownBox" runat="server" >
    </asp:DropDownList>
    <span>Pick ID </span>
    <br />
    <img alt="" id="loader" src="ajax-loader.gif" />
    <table>
        <tr>
            <td>
                <asp:Label ID="lblName"  ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
            </td>
            <td  style="font: 11px tahoma;">
                 Name
            </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblFamily"   ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
            </td>
            <td style="font: 11px tahoma;">
                Family
            </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblPhone"  ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
            </td>
            <td style="font: 11px tahoma;">
               Phone
            </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblEmail"  ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
            </td>
            <td style="font: 11px tahoma;">
                Email
            </td>
        </tr>
        <tr>
            <td>
                <asp:Label ID="lblAddress"  ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
            </td>
            <td style="font: 11px tahoma;">
                Address
            </td>
        </tr>
    </table>
</div>

So I decided to create an another page “GetCustomer.aspx” which by a query string , fetches the ID and then , it select all info from data base and save them in sessions.
here is the code behind of GetCustomer.aspx :

    protected void Page_Load(object sender, EventArgs e)
    {
        AppDomain.CurrentDomain.SetData("SQLServerCompactEditionUnderWebHosting", true);
        if (Request.QueryString.Keys.Count > 0)
        {
            string id = Request.QueryString[0];
            CustomersDBEntities db = new CustomersDBEntities();
            IQueryable<tblCustomer> allInfo = (from x in db.tblCustomers
                                               where x.ID == int.Parse(id)
                                               select x);
            Session["Name"] = allInfo.ElementAt(1).ToString();
            Session["Family"] = allInfo.ElementAt(2).ToString();
            Session["Phone"] = allInfo.ElementAt(3).ToString();
            Session["Email"] = allInfo.ElementAt(4).ToString();
            Session["Address"] = allInfo.ElementAt(5).ToString();
        }


    }

finally I started to write a javascript script like below , but in success function ! what should am I Do ?

$(document).ready(function(){
    $('idDropDownBox').change(function(){
        $.ajax({
            type:"POST",
            contentType:"application/json; charset=UTF-8",
            data:"{CID:'"+ $('idDropDownBox').val() + "'}",
            url:'Default.aspx/GetCustomer",
            dataType:"json",
            success:function(data){
                //what should i do here
            }
        });
    });
});

Thanks for responses…

Answer 1

If my understanding is correct, you want to use the output of an ASP.Net page as the source for an AJAX call.

This is not the traditional way to work with ASP.Net though, but still you can do it

This is a simple example:

Output

ASPX – Target (empty, remove all html tags)

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Empty.aspx.cs" Inherits="WebApplication1.Empty" %>

ASPX – Target code behind

    protected void Page_Load(object sender, EventArgs e)
    {
        this.Response.ContentType = "application/json";

        var id = this.Request.QueryString["id"];
        // simulate your query using the id property
        var q = Enumerable.Range(1, 10);

        // set the following values using your real objects
        var f = new
        {
            Name = "your name " + id,
            Fam = "your family " + id,
            Phone = "your phone " + id,
            Email = "your email " + id,
            Address = "your address" + id
        };

        this.Response.Write(JsonConvert.SerializeObject(f));
    }

ASPX – Caller

Note, the table shown in this example, is exactly your code, I just copied

<script type="text/javascript" src="Scripts/jquery-1.7.2.min.js"></script>
<script type="text/javascript">
    function getData(id) {
        $.ajax({
            type: "GET",
            url: '<%: this.ResolveClientUrl("~/Empty.aspx") %>',
            dataType: "json",
            data: 'id=' + id,
            contentType: "application/json; charset=utf-8;",
            success: function (msg) {
                $("#<%: this.lblName.ClientID %>").text(msg.Name);
                $("#<%: this.lblFamily.ClientID %>").text(msg.Fam);
                $("#<%: this.lblPhone.ClientID %>").text(msg.Phone);
                $("#<%: this.lblEmail.ClientID %>").text(msg.Email);
                $("#<%: this.lblAddress.ClientID %>").text(msg.Address);
            }
        });
    }
    $(function () {
        $("#<%: this.ddl.ClientID %>").change(function () {
            getData($(this).val());
        });
    });
</script>

    <asp:DropDownList runat="server" ID="ddl">
        <asp:ListItem Text="1" Value="1" />
        <asp:ListItem Text="2" Value="2" />
    </asp:DropDownList>
<table>
    <tr>
        <td>
            <asp:Label ID="lblName"  ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
        </td>
        <td  style="font: 11px tahoma;">
             Name
        </td>
    </tr>
    <tr>
        <td>
            <asp:Label ID="lblFamily"   ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
        </td>
        <td style="font: 11px tahoma;">
            Family
        </td>
    </tr>
    <tr>
        <td>
            <asp:Label ID="lblPhone"  ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
        </td>
        <td style="font: 11px tahoma;">
           Phone
        </td>
    </tr>
    <tr>
        <td>
            <asp:Label ID="lblEmail"  ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
        </td>
        <td style="font: 11px tahoma;">
            Email
        </td>
    </tr>
    <tr>
        <td>
            <asp:Label ID="lblAddress"  ClientIDMode="Static" runat="server" Font-Names="Tahoma" Text=""></asp:Label>
        </td>
        <td style="font: 11px tahoma;">
            Address
        </td>
    </tr>
</table>